Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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M.Boyer*, A.J.Fernandez Carrion, S.Ory, A.I.Becerro , S.Villette, S.V.Eliseeva, S.Petoud, P.Aballea, G.Matzen, M.Allix*, 'Transparent Polycrystalline SrREGa3O7 Melilite Ceramics: Potential Phosphors for Tuneable Solid State Lighting', J. Mater. Chem. C 4 3238-3247 (2016) doi:10.1039/c6tc00633g

Full and congruent crystallization from glass is applied to the SrREGa3O7 melilite family (RE = Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Y). This innovative process enables the synthesis of polycrystalline ceramics exhibiting high transparency both in the visible and near infra-red regions, despite tetragonal crystal structures and micrometer scale grain sizes. Moreover, glass crystallization provides an original route to synthesize new crystalline phases which are not accessible from classic solid state reaction, as demonstrated for SrYbGa3O7 and SrTmGa3O7. To illustrate the potential optical applications of such materials, SrGdGa3O7 transparent polycrystalline ceramics are doped with Dy3+ or Tb3+/Eu3+ in order to generate white light emission under UV excitation. It is foreseen that such transparent melilite ceramic phosphors, prepared via a cost-effective process, can be successfully used in solid state lighting devices of considerable technological interest.